In our previous guide, we have shown that we can trigger ESP32 (with Arduino IDE) to send message to IBM Watson IoT in Presence of a Particular Samsung Galaxy Smartwatch. That process involves BLE and WiFi. In our one series of articles on Samsung Smartwatch as Proximity Switch, we triggered a local event, such as control of a LED. In our other series of articles, we used the IBM Watson IoT … [Read more...]
ESP32 Audio Output
The ESP32 has a built-in 8-bit DAC. Digital to the analogue signal converter or analogue-digital converter or DAC is a device to convert digital signals with binary data into current or analogue voltage signals. For better sound quality, we can use an external I2S codec and amp. Adafruit I2S amp uses a MAX98357A IC. The MAX98357 is a low-cost, digital pulse-code modulation (PCM) input amplifier. … [Read more...]
Note on Calculating Distance From RSSI Value of BLE Devices
A quick question from one reader after publication of Smartwatch BLE to Trigger IBM Watson IoT Event was "can I measure the distance in meters and broadcast?". The answer is - it is not reliable with easy formula against a single BLE device. If we were using Raspberry Pi, then we could think of using complex coding. BLE technology and works with Indoor Location Positioning is not new. RSSI … [Read more...]
Detect Samsung Smartwatch BLE and Trigger IBM Watson IoT Event
We can trigger ESP32 to send message to IBM Watson IoT in Presence of a Particular Samsung Galaxy Smartwatch. This involves BLE and WiFi. In our one series of articles on Samsung Smartwatch as Proximity Switch, we triggered a local event, such as control of a relay. In our other series of articles, we sent message to IBM Watson IoT with upon pressing a button (this guide and this guide). Now, … [Read more...]
Solve ESP32 Sketch Too Big Error on Arduino IDE
Sketch too big is a common issue faced inside Arduino IDE while working with BLE. Most of us set up the Arduino IDE for ESP32 and forget to alter any other settings of the IDE because except some situations, we never face this problem. The error will suggest you navigate to this official webpage of Arduino (which is not exactly related to ESP32), which will tell you … [Read more...]
Samsung Smartwatch as Proximity Switch : Part V [END]
This is the final part of the series. In Part I, we talked about the basics which continued to Part II. Part III had a working code non-specific to any particular device. Part IV had a partially working code specific to a particular device. circuitdigest.com's code (in Part IV) was not working with Samsung Galaxy Watch LTE. Samsung's smartwatches shutdown both BLE and traditional … [Read more...]
ESP32 BLE Server with Android App
BLE only works when one communication is active and stays ON. Else it remains in sleep mode. Beacons are great usage of BLE. In our series of articles on Samsung Smartwatch as Proximity Switch, we have used the ESP32 as client. In this article, we are talking about using ESP32 BLE as a server. In our series of articles on Samsung Smartwatch as Proximity Switch, we discussed GATT Service and BLE … [Read more...]
Samsung Smartwatch as Proximity Switch : Part IV
In the previous part of this topic (here is part III), we provided a sample code to create a basic BLE scanner. The code makes the ESP32's on-board LED to turn on whenever the watch comes in proximity. In our earlier parts of this series, we talked about filtering the MAC address and practical matters around Samsung Galaxy Watch. I found that the website circuitdigest.com worked with a similar … [Read more...]
Samsung Smartwatch as Proximity Switch : Part III
Instead of publishing a single article on a complex matter, we split into parts. This methodology makes the thing boring to the initial readers but in the long term, the readers can browse our website and fix themselves. In the previous two parts of this topic (here is part I and here is part II), we created the base with theory and practical so that even an unused reader does not get confused or … [Read more...]
Samsung Smartwatch as Proximity Switch : Part II
This second part of the guide (here is the first part) ideally should have the working code matching with the title! But, ESP32 with Arduino IDE is not completely bug-free with BLE. So, instead of directly going to the topic, it will be practical for us to show some basic example codes which the readers can test on their setup. Not all of the readers can be expected to be used with BLE of ESP32 … [Read more...]
Samsung Smartwatch as Proximity Switch : Part I
It is not just easy to use the BLE of Samsung Galaxy Smartwatch. Because BLE of Samsung Galaxy Smartwatch is designed to work with their intended purposes, such as Samsung Flow software. Reading our previous article on GATT will help to understand the basic things we need to know to work with ESP32. We need to obtain the BLE hardware address, Service UUID and Characteristic UUID of the server. … [Read more...]